Those were my thoughts exactly, about how on earth do the uninvolved actors keep a straight face and continue to behave in a convincingly natural fashion. I suspect that this kind of theme in Japanese porn might be a kind of pushback against the highly conformist nature of Japanese society.

The girls have to pretend like nothing is going on. The real turn on is when they can't "pretend" to be normal anymore and give into the sex. The moaning, the stopping of what they're doing, them standing on their tipy toes. That's when you know they're digging it. Also, that girl in the beginning got creampied 3 times!!! Once in the beginning, then the stairwell and finally at the end!! Yeah!!!!

usually i don't like Japanese porn the voices are usually too confusing (a mix between sexual assualt/pleasure and trying way too had to be cute) but this was perfection. it was like a normal day of school except for the fact that some random invisible dude in an all girls school was doing everyone in the class with no one realizing.
i loved it

You can tell from the Japanese script that the whole video is in mirror-image (possibly an attempt to defeat automated plagiarism detection). The sign says "Welcome to 3C", which in this case will refer to homeroom class "C" at third-year level in (Japanese) middle school.

3 gen out of japan, n I don't understand one word of any of it, but they come up with the most interesting stories, committed buggahs, stop with the embarrassment, wahine look like they enjoy it n hope they getting paid too

I know the birth rate is very low in Japan so I guess this is a way to
counteract the problem, ......lol. (Can the Japanese get any weirder)??
I.E. (The mother son sex game shows) These would have been spectacular
if it weren't for the censorship.